The best whole house water softener and filtration system for your supply

Advertised prices, verified

How to choose a combined softener and filter package

1. Test before you shortlist. Get hardness, iron, manganese, pH and, on a well, bacteria measured. A combined package is only the right purchase if both halves of it are answering something the test actually found in your supply.
2. Decide combined or separate units. Combination units save space and are simpler to install, while separate tanks are easier to service and let each stage be sized and replaced on its own schedule. Heavy iron or sediment usually argues for separate units.
3. Size both halves for your flow. The softener is sized on hardness multiplied by household water use, and the filter is sized on the peak flow the house can draw. Getting one right and the other wrong still leaves you with a pressure or capacity complaint.
4. Compare valves, media and warranties. Check the control valve type, the resin grade, what filtration media is included and how the warranty splits between tank, media and valve. These are the differences that decide service life rather than the badge on the front.
5. Confirm what installation adds. Check whether the quoted price includes fitting, a bypass loop, the drain connection and removal of an old unit. Comparing an equipment-only price against an installed price is how two similar systems appear to differ wildly.

What each half of the system is doing

Softening is ion exchange: calcium and magnesium are swapped for sodium as water passes through a resin bed, which is what stops scale forming in the water heater and lets soap lather properly. It needs salt, a drain and regular regeneration to keep working.

Filtration is a different mechanism entirely. Sediment media strain particles, carbon adsorbs chlorine and taste compounds, and specialty beds oxidize and trap iron. None of them softens, which is exactly why the two halves are sold together for households that have both problems.

When separate units beat a combined one

Where iron is present in any quantity, a dedicated iron filter ahead of the softener protects the resin and is sized on the iron result rather than on hardness. Combined units generally assume a lighter load, so a well with a real iron problem is usually better served by two tanks.

Separate units also age separately. Media in a filter bed and resin in a softener have different service lives, and replacing them independently is cheaper and simpler than dealing with a single vessel that has to be taken out of service as a whole.

Reading the table before you commit

The prices shown are the vendors' published figures for the equipment. Installation, the bypass loop and the drain connection are normally quoted separately, so check what each package includes before concluding that one supplier is cheaper than another.

It is also worth checking whether a package described as a softener and filter combination includes real filtration media or simply a sediment cartridge on the inlet. Our whole house water softener and filtration guide sets out what belongs in each stage of a combined train.

Common questions

Do I need both a softener and a filter?

Only if your water test shows both hardness and something a filter treats. Scale and poor lather point to softening, while taste, sediment or iron point to filtration.

Is a combined unit better than two separate tanks?

It saves space and simplifies installation. Separate tanks are easier to size, service and replace, and they cope far better with a real iron or sediment load.

What does a combined system cost?

Published vendor prices vary by capacity and by what filtration is included, with a median of $1,531 across the systems compared in the table below.

Which stage goes first?

Sediment and iron treatment go ahead of the softener so that resin receives clear water, and carbon protects the resin from chlorine on a municipal supply.

Browse by system type

• Compare Water softeners on advertised prices
• Compare Salt-free softeners on advertised prices
• Compare Whole-house filters on advertised prices
• Compare Reverse osmosis systems on advertised prices
• Compare Shower filters on advertised prices
• Compare Countertop filters on advertised prices
• Compare Refrigerator filters on advertised prices
• Compare Iron filters on advertised prices